Rima Ariadaeus is a linear rille on the Moon at 6.4°N 14.0°E. It is named after the crater Ariadaeus, which marks its eastern end. Over 300 kilometers long, it is thought to have been formed when a section of the Moon’s crust sank down between two parallel fault lines (making it a graben or fault trough). It is a relatively young lunar feature, with few craters or other features overlying it.

Description:
Circular formation forming a remarkable trio with Cyrillus and Catharina. Tormented and steep slopes overhanging Sinus Asperitatis from 1200m and supporting Cyrillus to the South-East Theophilus F to the West and Mädler to the East. Very high walls with terraces overlapped by Theophilus B to the North-West. Flat floor. Imposing central mountain 1 400 m high with 4 summits. Line of crests hills and craterlets.